I just received my new 15" powerbook and was trying to tweak with the Energy Savings settings when I noticed something odd. My boyfriends 17" from last February has this "Processor Performance" drop down menu under the options tab and mine does not. I also remember this from my old ibook. His has all the new updates as does mine. So why am I missing this functionality? Has anyone else noticed this? and does anyone have any idea how to tweak it? I would also love any suggestions on the best settings for reducing heat and maximizing battery life (other then choosing the better battery life setting of course! ). thanks!